CLEAR DEKRA REPORT - CAR BROKEN 4 WEEKS LATER!!!!!!

Visited the Brackenfell and Montague Gardens branches. Viewed several cars and then settled for a car thats Dekra report was CLEAR. The sales consultant even said that this was a good buy. Within the first few days, noticed that i have to put in water every 2 days. Also noticed a oil leak. 4 weeks later, a coolant warning came on and i took the car to a mechanic same day. Suddenly was hit with a R30 000 account due to oil leaking, cylinder head needing to be overhauled, oil in the water pump. When i bought the car, the engine area was so clean and coupled with the clear Dekra report but a few days later the engine area had oil all over and the ground has leak marks on it. When we took it for a test drive the car didnt want to start which the sales consultant chalked down to the car standing for a while, but this has not changed. The car struggles to start EACH AND EVERY time. Webuycars has yet to call me back and attend to the complaint i have logged. THIS HAS BEEN THE WORST EXPERIENCE SO FAR